People ride a boat during heavy floods on a main street in Bosanski Samac

People ride a boat during heavy floods on a main street in Bosanski Samac May 19, 2014. Bosnia said on Monday that more than a quarter of its 4 million people had been affected by the worst floods to hit the Balkans in living memory, comparing the "terrifying" destruction to that of the country's 1992-95 war. The extent of the devastation became apparent in Serbia too, as waters receded in some of the worst-hit areas to reveal homes toppled or submerged in mud, trees felled and villages strewn with the rotting corpses of livestock. REUTERS/Srdjan Zivulovic (BOSNIA AND HERZEGOVINA - Tags: DISASTER ENVIRONMENT)

Floods sweep Serbia and Bosnia

Serbia on Tuesday declared three days of national mourning and reported another death in the worst rainfall to hit the Balkan region in living memory, even as the rising River Sava threatened more havoc. (Reuters)